Lectures should go from being like the family singing around the piano to high-quality concerts.

AIDS itself is subject to incredible stigma.

The power of capitalism to mediate the gap between rich and poor is pretty incredible. Indeed, I think, year by year, the gap gets less.

There's always a tricky issue when you get into stolen material or pornography. The laws for online publishing the same as for print-based publishing, where if you're hosting certain types of things and somebody notifies you about that.

Bitcoin is a technological tour de force

Don't let complexity stop you.

Bioterrorism is like earthquakes, you should think in order of magnitudes. If you can kill 10 people that's a one, 100 people that's a two... Bioterrorism is the thing that can give you not just sixes, but sevens, eights and nines.